How do you set an assignee based on a custom field?

We are using Service Desk for a project that maps to the issue type task on the back end. For this service desk there are 6 choices for "Customer Request Type." Depending on which of the 6 choices is selected in the customer request type field we want the issue to automatically update the issue's assignee. Is this possible?

If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...